package removeRepeate;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;

import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;

public class Dedup {
	public static class Map extends Mapper<Object, Text, Text, Text> {
		private static Text line = new Text();

		public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
			line = value;
			context.write(line, new Text(""));
		}
	}

	public static class Reduce extends Reducer<Text, Text, Text, Text> {
		public void reduce(Text key, Iterable<Text> values, Context context) throws IOException, InterruptedException {
			context.write(key, new Text(""));
		}
	}

	public static void main(String[] args) throws Exception {
		Configuration conf = new Configuration();
		conf.set("mapred.job.tracker", "192.168.8.70:8020");
		String ioArgs[] = new String[] { "hdfs://192.168.8.70:8020/kxd/dedup_in", "hdfs://192.168.8.70:8020/kxd/dedup_out" };
		String[] otherArgs = new GenericOptionsParser(conf, ioArgs).getRemainingArgs();
		if (otherArgs.length != 2) {
			System.err.println("Uage:Data Deduplication in out");
			System.exit(2);
		}

		Job job = new Job(conf, "Data Deduplication");
		job.setJarByClass(Dedup.class);
		job.setMapperClass(Map.class);
		job.setCombinerClass(Reduce.class);
		job.setReducerClass(Reduce.class);

		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(Text.class);

		FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
		FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
		System.exit(job.waitForCompletion(true) ? 0 : 1);

	}
}
